The numbering plan indicator (NPI) is a number which is defined in the ITU standard Q.713, paragraph 3.4.2.3.3, indicating the numbering plan of the attached telephone number. NPIs can be found in SCCP and SMS messages. As of 2004, the following numbering plans and their respective numbering plan indicator values have been defined:
| NPI | Description | Standard |
|---|---|---|
| 0 | unknown | |
| 1 | ISDN Telephony | E.164 |
| 2 | generic | |
| 3 | data | X.121 |
| 4 | telex | F69 |
| 5 | maritime mobile | E.210 and E.211 |
| 6 | land mobile | E.212 |
| 7 | ISDN/mobile | E.214 |
Read more about this topic: Telephone Numbering Plan
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—William Shakespeare (1564–1616)
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